Investments in Securities and Fair Value Investments in Securities (Schedule of Earnings on Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest and dividends	$ 3,773	$ 4,393
Fixed maturity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest and dividends	2,337	2,688
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest and dividends	1,413	1,569
Invested cash and other short-term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest and dividends	21	133
Miscellaneous interest
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest and dividends	$ 2	$ 3